/Engine/Plugins/Experimental/GameplayGraph/Source/GameplayGraph/Public/Graph/GraphIsland.h
Delegate to track the event when the island has a node added to it.
typedef TMulticastDelegate_TwoParams< void, const [FGraphIslandHandle](API\Plugins\GameplayGraph\Graph\FGraphIslandHandle) &, const [FGraphVertexHandle](API\Plugins\GameplayGraph\Graph\FGraphVertexHandle) & > FOnGraphIslandVertexAdded